ZW10-12/630-20 series outdoor high-voltage dual power automatic switching device (Hereinafter referred to as device) composed of High-voltage vacuum circuit breaker and intelligent controller. Widely used for AC 50 Hz, rated voltage 12kV, rated current 630A dual power supply system. As one circuit outage or under-voltage automatically switch to other normal power supply to reliably ensure the continuity of power. The protection and interlock for short circuit and over current effectively avoid unnecessary re-loading power failure impact. In the commonly used power outage power failure, the switching device can automatically switch with the backup power supply to ensure the reliability and security. According to needs of load, automatically switch between two circuits. As important electrical control devices, especially used for important place which does not allow power failure ensure a continuous power supply. This product which is dual power supply with automatic-recovery & automatic-switching has more advantages such as new generation of innovative, safe and reliable, performance improved, high degree of automation, wide usage and so on. Products designed for ensuring complete isolation of dual high-voltage power supply, with sound and reliable mechanical and electrical chain, it has a very high safety and reliability. The product is suitable for dual supply system control users who required strictly reliability and security, as controller and protector of the dual power supply system. 1. 3 phases posts structure, reliable breaking capacity, no burning or explosive danger, free-maintenance, small volume, long service life. 2. Whole sealing structure. Vacuum arc-blowing chamber, operation systems are sealed in the case. 3. Small spring operation mechanism. 4. Manual or electri type operation of close & open of breaker.1. Ambient air temperature: -5~+40 and the average temperature should not exceed +35 in 24h. 2. Altitude above sea level for operation site should not exceed 2000M. 3. Relative humidity should not exceed 50% at max temperature +40. Higher relative humidity is allowed at lower temperature. Ex. 90% at +20. But in view of the temperature change, it is possible that moderate dews will produce casually. 4. Installation gradient not exceed 5°. 5. Install in the places without fierce vibration and shock and the sites insufficient to erode the electrical components. 6. Any specific requirement, consult with manufactory.